Electronic Devices-Active Filters
Electronic Devices-Active Filters
11. The critical frequency is defined as the point at which the response drops ________ from the passband.
- –20 dB
- –3 dB
- –6 dB
- –40 dB
12. Filters with the ________ characteristic provide a very flat amplitude in the passband and a roll-off rate of –20 dB/decade/pole.
- Butterworth
- Chebyshev
- Bessel
- [NIL]
13. Which filter exhibits the most rapid roll-off rate?
- Bessel
- Butterworth
- Chebyshev
- all of the above
14. Which filter has a maximally flat response?
- Bessel
- Butterworth
- Chebyshev
- all of the above
15. A low-pass filter has a cutoff frequency of 1.23 kHz. Determine the bandwidth of the filter.
- 2.46 kHz
- 1.23 kHz
- 644 Hz
- 644 Hz
16. A third-order filter will have a roll-off rate of
- –20 dB/decade.
- –40 dB/decade.
- –60 dB/decade.
- –30 dB/decade.
17. A ________ filter passes all frequencies within a band between a lower and an upper critical frequency and rejects all others outside this band.
- low-pass
- high-pass
- band-pass
- band-stop
18. A band-pass filter can be created by cascading a high-pass filter and a low-pass filter.
- TRUE
- FALSE
19. The bandwidth of a band-pass filter is the sum of the two cutoff frequencies.
- TRUE
- FALSE